The Secret Service has confirmed that two packages containing "explosive devices" were intercepted by its agents. The packages contained "functional explosive devices" and were addressed to former President Barack Obama and one to Hillary Clinton.

UPDATES: Time Warner center has been completely evacuated. A 4th package was discovered addressed to Debbie Wasserman Schultz in Sunrise Florida. The package sent to CNN was addressed to former CIA Director John Brennan.

The San Diego Union-Tribune building was evacuated this morning after receiving a suspicious package.  It has not been confirmed if this is related to the other devices.

A suspicious package was sent to former AG Eric Holder, but it was the wrong address, so it was returned to the return address ... which was that of Debbie Wasserman Schultz.

A white powder / substance was included in one of the packages and is being investigated further.

The Governor of New York's office was also sent an explosive device.

CNN's New York Headquarters was also evacuated Wednesday morning after reports of a suspicious device. Officials are still investigating the scene at CNN HQ.

The packages were detected and intercepted by the U.S. Secret Service, which has opened a criminal investigation into the incidents.

“The packages were immediately identified during routine mail screening procedures as potential explosive devices and were appropriately handled as such,” the Secret Service said in an emailed statement Wednesday. “The protectees did not receive the packages nor were they at risk of receiving them.”

“We condemn the attempted violent attacks recently made against President Obama, President Clinton, Secretary Clinton, and other public figures,” White House press secretary Sarah Huckabee Sanders said in a statement. “These terrorizing acts are despicable, and anyone responsible will be held accountable to the fullest extent of the law.”

The FBI’s New York field office said in a tweet that its Joint Terrorism Task Force “has engaged with our federal, state and local partners to investigate” the package sent to the Clintons.

Authorities believe at least one of the devices to be linked to the explosive device that was sent to George Soros earlier in the week.

An ongoing investigation is currently underway.